Shaftless screw conveyors are the most widely used equipment in environmental protection conveying, sludge conveying, kitchen waste conveying, and particle & powder material conveying scenarios.
However, many customers have reported frequent equipment problems: newly replaced blades fail quickly, frequent material blockages, severe vibration, insufficient throughput capacity, and easy fracture.
In fact, 90% of high failure rates of shaftless screw blades are not caused by mechanical aging, but by improper equipment selection, defective processing technology, non-standard installation and mismatched operating conditions.
This article comprehensively sorts out the frequent common faults, root causes and solutions of shaftless screw blades, providing practical on-site construction insights for your reference.
1. Blade Fracture, Cracking and Root Tearing
Common Causes
1. The blade steel plate is too thin; the absence of a central mandrel results in insufficient overall bearing capacity. 2. Excessive installation inclination angle causes material backflow due to self-weight, leading to long-term overload pulling of blades. 3. Misalignment and uneven joints of sectional blades cause concentrated stress during operation. 4. Long-term impact and wear from materials containing sand, stones and other hard impurities.
Solutions
- Adopt thickened plates and high-manganese wear-resistant steel for high-load operating conditions. - Increase power and optimize blade dimensional specifications for inclined conveying scenarios. - Strictly control the alignment accuracy of segmented joints to ensure smooth integrated operation of the screw.
2. Segmented Splicing Misalignment and Large Joint Gaps (Most Common Processing Defect)
Phenomena
Severe equipment operation jitter and abnormal noise, material jamming at joints, and accelerated local wear.
Causes
Small manufacturers lack precision tooling fixtures, leading to inconsistent pitch, outer diameter and phase of blades. The spliced screw presents discontinuous trajectories and step gaps.
Solutions
Adopt CNC integral calibration technology to realize unified alignment of sectional blades, achieve seamless connection and integrated smooth screw operation, and eliminate vibration and material jamming from the source.
3. Material Blockage, Backflow and Poor Conveying
Phenomena
Fast feeding speed but slow discharging speed, severe material accumulation in the tank, frequent motor stalling and circuit tripping.
Causes
1. Excessive installation inclination angle leads to material backflow by gravity. 2. Thinned blades caused by wear result in insufficient material pushing force. 3. Mismatched helical pitch and unreasonable material filling ratio design. 4. Accumulation and wall adhesion of viscous materials.
Solutions
Strictly control the conveying installation inclination angle, match the helical pitch according to actual demands, regularly clean materials adhered to the conveyor trough wall, and replace worn blades in a timely manner to guarantee stable material pushing power.
4. Declining Conveying Capacity and Severe Efficiency Attenuation
Causes
1. Wear on blade edges reduces the effective material pushing area. 2. Splicing deviation increases running resistance. 3. Undersized motor power fails to bear the load. 4. Material accumulation and slipping in the tank.
Solutions
Match the blade diameter and motor power according to actual operating conditions, adopt wear-resistant blades, ensure standard helical forming, reduce overall equipment operation resistance, and achieve stable and efficient conveying.
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